In the early spring, the cultivation of radishes in plastic greenhouses is simple, requires less labor, and has less pests and diseases. It is the first choice for agricultural structure adjustment and scale planting. In the spring of 1999, I introduced more than 20 acres of radish, more than 2,500 kilograms of radish per mu, and an income of more than 4,000 yuan per mu. The economic benefits are very significant. The main cultivation techniques are as follows:
1, variety selection. In early spring, due to the low temperature, the radish is easy to convulsion. Therefore, it is advisable to use varieties with strong winter and strict requirements for vernalization, such as Chunbai No. 2, Dagang Dagen, Baiyuchun, etc.
2. Selecting land, deep tillage, and applying base fertilizer. It is best to choose the deep sandy loam soil, and the deep ploughing should be done early in the greenhouse. When the time is sufficient, the frozen soil can be 7-10 days to facilitate loosening. Apply enough base fertilizer, 3500 kilograms of fermented organic fertilizer, 40 kilograms of high-efficiency compound fertilizer, 2 kilograms of biological potassium fertilizer, and 100 kilograms of grass ash. 2 畦 in the shed, and requires the soil to be loose, the surface is smooth, and the soil is evenly divided.
3, sowing, fixed seedlings. According to market conditions, seeding can be carried out in phases from mid-December to late February. I am suitable for the middle and late January. Each line is 6 rows, the plant spacing is 30 cm, and 2 seeds per hole. 1 seedling after emergence, leaving 1 strong seedling in each hole. The amount of sowing is 100 grams per mu. The seedlings should be thoroughly poured before sowing to facilitate emergence.
4. Field management. The seedling period is in the most severe cold month of the locality. It should be watered as little as possible, and the small arch shed insulation in the greenhouse should be used to reduce the temperature below 10 °C in the shed, and the low temperature below 0 °C should be eliminated to ensure that it does not pass vernalization. It is subjected to freezing damage and promotes the growth of rosette leaves. After the victory, the manure and urine should be applied once in combination with the watering. After that, the kneading surface must be kept moist. The dry and wet alternately should not be excessive, causing the cracking of the fleshy root. During this period, the weather temperature has gradually increased. It is necessary to pay attention to ventilation and cooling. The daytime temperature is maintained at 20-25 °C and the night temperature is 15 °C to facilitate the accumulation and expansion of nutrients in the fleshy roots.
5. Pest control. The disease of greenhouse radish is mainly caused by the black rot caused by high temperature and high humidity during the period of swelling of fleshy roots, which can be prevented by strengthening ventilation and cooling. The insect pest is mainly aphid, and it can be controlled by spraying with 10% imidacloprid wettable powder 2500 times.
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